<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            width: 200px;
            height: 360px;
            border: 2px solid #ccc;
            float: left;
            margin-left: -2px;
            position: relative;
        }
        
        div:hover {
            border: 2px solid red;
            z-index: 1;
        }
    </style>
</head>

<body>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>

</body>

</html>